package com.hmdp.service.impl;

import com.hmdp.dto.Result;
import com.hmdp.entity.SeckillVoucher;
import com.hmdp.entity.VoucherOrder;
import com.hmdp.mapper.VoucherOrderMapper;
import com.hmdp.service.ISeckillVoucherService;
import com.hmdp.service.IVoucherOrderService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisIDWorker;
import com.hmdp.utils.UserHolder;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.time.LocalDateTime;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service

public class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {

    @Resource
    private ISeckillVoucherService seckillVoucher;

    @Resource
    private RedisIDWorker redisIDWorker;

    @Override
    @Transactional
    public Result seckillVoucher(Long voucherId) {
        // 1. 查询优惠券信息
        SeckillVoucher voucher = seckillVoucher.getById(voucherId);
        if (null == voucher)
            return Result.fail("没有此优惠券");
        // 3. 判断秒杀是否开始
        if (voucher.getBeginTime().isAfter(LocalDateTime.now())) {
            return Result.fail("秒杀未开始");
        }
        // 4. 判断秒杀是否结束
        if (voucher.getEndTime().isBefore(LocalDateTime.now())) {
            return Result.fail("秒杀已结束");
        }
        // 2. 判断优惠券库存
        if (voucher.getStock() < 1) {
            return Result.fail("库存不足");
        }
        // 5.扣减库存
        boolean flag = seckillVoucher.update()
                .setSql("stock = stock - 1")
//                .eq("stock", voucher.getStock()).update();
                .gt("stock", 0).update();
        if (!flag) {
            return Result.fail("库存不足");
        }
        // 6.创建订单
        VoucherOrder voucherOrder = new VoucherOrder();
        // 6.1 订单id
        Long order = redisIDWorker.nextId("order");
        voucherOrder.setId(order);
        // 6.2 用户id
        voucherOrder.setUserId(UserHolder.getUser().getId());
        // 6.3 代金券id
        voucherOrder.setVoucherId(voucherId);
        save(voucherOrder);

        // 7. 返回订单id
        return Result.ok(order);
    }
}
